Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 350 · 40 questions

The trick (Choose a trick): × 9 → finger trick; × 4 → double double; × 10, 100, 1000 → slide and add zeros. 37, 12345679 or 111… → magic patterns; reverse and subtract → 1089. Puzzles: find the rule, the total or the leftover days, then check your answer.

1. 1.51 × 4 =
2. 2.3?22 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
3. 3.610 × ? = 6100
4. 4.23 × 1000 =
5. 5.2?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
6. 6.32 × 4 =
7. 7.1 + 2 + 3 + … + 21 =
8. 8.9 × 4 = 3? — what is the missing digit?
9. 9.If today is Sunday, what day will it be after 93 days? (a) Wednesday (b) Monday (c) Friday (d) Tuesday
10. 10.Magic square (every row, column and diagonal has the same total): 13 14 9 | ? 12 16 | 15 10 11. What is the missing number?
11. 11.16 × 1000 =
12. 12.Think of 11. Multiply it by 5, then add 7. What number do you end with?
13. 13.1 + 2 + 3 + … + 16 =
14. 14.Do the 1089 trick with 229: reverse and subtract, then reverse that answer and add. What do you get?
15. 15.1 + 2 + 3 + … + 68 =
16. 16.363? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.39 × ? = 39000
18. 18.Think of 3. Multiply it by 4, then add 6. What number do you end with?
19. 19.3 × 1000 =
20. 20.35 × 100 =
21. 21.Magic square (every row, column and diagonal has the same total): 14 9 16 | 15 13 11 | 10 17 ?. What is the missing number?
22. 22.Half of 22 =
23. 23.Odd one out: which number is NOT in the 5 times table? (a) 15 (b) 25 (c) 10 (d) 18
24. 24.4 × 100 =
25. 25.9 × 10 =
26. 26.In 5 years a boy will be 14 years old. How old was he 7 years ago?
27. 27.Magic square (every row, column and diagonal has the same total): 6 13 8 | 11 9 7 | ? 5 12. What is the missing number?
28. 28.9 × 5 = 4? — what is the missing digit?
29. 29.17 × 4 =
30. 30.The 7th of a month is a Sunday. What day is the 24th of the same month? (a) Tuesday (b) Saturday (c) Wednesday (d) Thursday
31. 31.A piggy bank has 8 coins of ₹5 and 11 coins of ₹2. How many rupees are in it?
32. 32.If today is Saturday, what day will it be after 45 days? (a) Tuesday (b) Wednesday (c) Friday (d) Monday
33. 33.Take 971. Reverse its digits and take the smaller number away from the bigger one. What do you get?
34. 34.1 + 3 + 5 + … + 15 =
35. 35.Magic square (every row, column and diagonal has the same total): 19 9 11 | 5 13 ? | 15 17 7. What is the missing number?
36. 36.The 2nd of a month is a Saturday. What day is the 22nd of the same month? (a) Monday (b) Friday (c) Thursday (d) Saturday
37. 37.693 + 396 =
38. 38.The ages of two twins add up to 26. How old is each twin?
39. 39.19 × 4 =
40. 40.1?09 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

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